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WO2008060921A1 - Procédure de messagerie cts2self série - Google Patents

Procédure de messagerie cts2self série Download PDF

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Publication number
WO2008060921A1
WO2008060921A1 PCT/US2007/083948 US2007083948W WO2008060921A1 WO 2008060921 A1 WO2008060921 A1 WO 2008060921A1 US 2007083948 W US2007083948 W US 2007083948W WO 2008060921 A1 WO2008060921 A1 WO 2008060921A1
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WO
WIPO (PCT)
Prior art keywords
channel
subsequent
sta
reservation confirmation
channel reservation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/083948
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English (en)
Inventor
Matthew J. Fischer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Broadcom Corp
Original Assignee
Broadcom Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Broadcom Corp filed Critical Broadcom Corp
Priority to EP07844949.3A priority Critical patent/EP2084862B1/fr
Priority to CN2007800298470A priority patent/CN101502064B/zh
Priority to HK10101237.9A priority patent/HK1137581B/xx
Priority to KR1020097000331A priority patent/KR101115438B1/ko
Publication of WO2008060921A1 publication Critical patent/WO2008060921A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance

Definitions

  • IEEE 802.1 1 describes a communication architecture, which may enable computing devices to communicate via wireless local area networks (WLANs).
  • WLANs wireless local area networks
  • One of the building blocks for the WLAN is the basic service set (BSS).
  • BSS may comprise a plurality of computing devices, or stations (STA), which may communicate wirelessly via one or more RF channels within a coverage area.
  • STA stations
  • the span of a coverage area may be determined based on the distance over which a source STA may transmit data via an RF channel, which may be received by a destination STA.
  • a destination STA may respond to a received RTS frame by sending a clear to send (CTS) frame.
  • CTS clear to send
  • the CTS frame may identify that originating STA, which was identified in the received RTS frame by the destination STA.
  • the CTS frame may be transmitted via the RF channel, which was assigned for communications between the originating STA and the destination STA.
  • the CTS frame may be transmitted via the primary channel.
  • the originating STA may determine that access to the wireless medium has been acquired.
  • a serial clear to send (CTS) to self (CTS2SELF) messaging procedure substantially as shown in and/or described in connection with at least one of the figures, as set forth more completely in the claims.
  • FIG. 1 is a block diagram of an exemplary system for wireless data communication, which may be utilized in connection with an embodiment of the invention.
  • FIG. 3 is a diagram illustrating an exemplary serial clear to send to self messaging procedure, in accordance with an embodiment of the invention.
  • FIG. 5 is a diagram illustrating an exemplary serial clear to send to self messaging procedure with delayed transmission of data frames via the primary channel and secondary channel, in accordance with an embodiment of the invention.
  • FIG. 6 is a diagram illustrating an exemplary serial clear to send to self messaging procedure with cancellation of access for the primary channel, in accordance with an embodiment of the invention.
  • an originating wireless station which utilizes a 40 MHz RF channel may attempt to gain access to a wireless communication medium by transmitting a clear to send (CTS) frame via the primary channel and by transmitting a CTS frame via a secondary channel.
  • the CTS frames may be sent in a serial fashion.
  • the originating STA may send a CTS frame via the primary channel and, at a subsequent time instant, send a CTS frame via the secondary primary channel.
  • Each CTS frame sent via the primary channel and the secondary channel may contain an address, which identifies the originating STA.
  • each CTS frame represents a CTS2SELF message.
  • FIG. 1 is a block diagram of an exemplary system for wireless data communication, which may be utilized in connection with an embodiment of the invention.
  • a BSS_1 1 12 comprises an AP_1 122, a WLAN station STA_A 124 and an STA_B 126.
  • the BSS_2 1 14 comprises an AP_2 132, an STA_X 134 and an STA_Y 136.
  • the AP_1 122 may communicate with STA_A 124 via a
  • the AP 1 122 may communicate with STA B 126 via a 40 MHz RF channel 146.
  • the AP_1 122 may negotiate with the STA_A 124 to establish an RF channel assignment and RF channel bandwidth based on, for example, the transmission of beacon frames.
  • the RF channel assignment may comprise a center frequency, which may be utilized in connection with the 20 MHz RF channel bandwidth to determine the range of frequencies utilized by the RF channel 144.
  • the AP 1 122 may negotiate with the STA B 126 to establish an RF channel assignment and RF channel bandwidth based on, for example, the transmission of beacon frames.
  • the 40 MHz RF channel 146 may comprise a primary channel and a secondary channel.
  • the AP_2 132 may communicate with STA_X 134 via a
  • the AP_2 132 may communicate with STA_Y 136 via a 20 MHz RF channel 156.
  • the AP_2 132 may negotiate with the STA_X 134 to establish an RF channel assignment and RF channel bandwidth based on, for example, the transmission of beacon frames.
  • the RF channel assignment may comprise a center frequency, which may be utilized in connection with the 20 MHz RF channel bandwidth to determine the range of frequencies utilized by the RF channel 154.
  • the AP 2 132 may negotiate with the STA Y 136 to establish an RF channel assignment and RF channel bandwidth based on, for example, the transmission of beacon frames.
  • the 20 MHz RF channel 156 may comprise the range of frequencies utilized by the RF channel 154.
  • the DS 104 may provide an infrastructure, which may be utilized to enable any of the STAs within the BSS_1 1 12 to communicate with any of the STAs within BSS_2 1 14, or vice versa.
  • the DS 104 may utilize wireless communication (for example, via one or more RF channels), wired communication (for example, via copper or optical fiber cabling) or a combination thereof.
  • STAs within the BSS_1 1 12 may transmit and/or receive data to and/or from the DS 104 via the AP 1 122.
  • the AP 1 122 may transmit and/or receive data to and/or from the DS 104 via the interface 162.
  • the STA B 126 may attempt to access the wireless communication medium to reduce the likelihood that collisions may occur during transmission of data.
  • the STA B 126 may first attempt to receive signals via the wireless communication medium that comprise one or more frequencies that are within the 40 MHz bandwidth of the RF channel 146 to determine whether any other STAs, which are transmitting RF signals within a coverage area that includes the STA B 126, are presently utilizing one or more of the frequencies within the RF channel 146 bandwidth to transmit signals.
  • the STA B 126 may transmit an RTS frame via the primary channel portion of the RF channel 146.
  • the RTS frame may identify the STA A 124 as an originating STA and may identify the AP_1 122 as a destination STA.
  • the AP_1 122 other STAs within the BSS_1 1 12, which are within the coverage area for RF signals transmitted by the STA B 126, may receive the RTS frame transmitted by the STA B 126 via the primary channel portion of the RF channel 146.
  • the AP 1 122 may respond to the RTS frame by transmitting a CTS frame.
  • the CTS frame may identify the STA B 126 as the destination STA for the CTS frame.
  • STAs STA_X 134 and/or STA_Y 136 and APs AP_2 132 within the BSS 1 14, which are within the coverage area for RF signals transmitted by the STA B 126, may receive the RTS frame transmitted by the STA B 126 when those STAs and/or APs are configured to receive signals via one or more frequencies contained within the primary channel portion of the RF channel 146.
  • STAs STA_X 134 and/or STA_Y 136 and/or APs AP_2 132 within the BSS_2 1 14 may not receive the RTS frame transmitted by the STA B 126 via the primary channel portion of the RF channel 146, when the STAs and/or APs within the BSS_2 1 14 are configured to receive signals via one or more frequencies contained within the secondary channel portion of the RF channel 146.
  • the STA B 126 may communicate with STA A 124 by sending data frames to the AP 1 122 via the 40 MHz RF channel 146.
  • the data frames may be transmitted via the primary channel portion and/or secondary channel portion of the RF channel 146 by utilizing OFDM.
  • the STAs STA_X 134 and/or STA_Y 136 and/or APs AP 2 132 within the BSS_2 1 14 are configured to receive signals via one or more frequencies within the secondary channel portion of the RF channel 146
  • the STAs STA X 134 and/or STA Y 136 and/or APs AP 2 132 may also be configured to utilize CCK modulation when receiving transmitted data signals and may not detect the signals and/or data frames utilizing OFDM that are transmitted by the STA B 126 via the secondary channel portion of the RF channel 146.
  • the STAs STA_X 134 and/or STA_Y 136 and/or APs AP_2 132 within the BSS_2 1 14 may attempt to detect the presence of signal energy within the wireless communication medium but may utilize a signal detection threshold level that does not enable detection of the signals transmitted by the STA B 126. Consequently, any of the STAs STA_X 134 and/or STA_Y 136 and/or APs AP_2 132 within the BSS_2 1 14 may incorrectly determine that the frequencies within the RF channel bandwidth 154 and/or 156 are not currently being utilized for the transmission of signals and/or data frames.
  • the STA_B 126 may commence transmission of one or more data frames via the 40 MHz RF channel 146.
  • the data frames sent by the STA B 126 may identify the AP 1 122 as the recipient.
  • the data frames may be transmitted by the STA B 126 utilizing OFDM.
  • the signals transmitted by the STA B 126 may be distributed across a coverage area that comprises at least a portion of the BSS_1 1 12 and at least a portion of the BSS_2 1 14.
  • the portion of the BSS_2 1 14 may comprise at least the location of one or more STAs STA X 134 and/or STA Y 136 and/or the AP 2 132.
  • a STA_X 134 or AP_2 132 within the BSS_2 1 14, for example, which is within the coverage area for signals transmitted by the STA B 126 may commence transmission of data frames.
  • the STA X 134 may transmit the data frames to the AP 2 132 via RF channel 154 utilizing CCK modulation.
  • the RF channel 154 may comprise at least a portion of the frequencies that are within the secondary channel frequency band for RF channel 146.
  • the signals transmitted vial the STA X 134 may be distributed across a coverage area that comprises at least a portion of the BSS_2 1 14 and at least a portion of the BSS_1 1 12.
  • the portion of the BSS_1 1 12 may comprise at least the location of STA_B 126 and/or the AP_1 122.
  • the concurrent transmission of signals via the 40 MHz RF channel 146 and the 20 MHz RF channel 154 within a common coverage area may result in collisions within the wireless communication medium.
  • the AP 1 122 may receive signals from the STA B 126 via frequencies within the primary channel portion of the RF channel 146, and may receive signals from both the ST A B 126 and from the STA X 134 via frequencies within the secondary channel portion of the RF channel 146.
  • the STA B 126 may attempt to access the wireless communication medium to enable transmission of data frames via the 40 MHz RF channel 146 by utilizing a serial CTS2SELF messaging procedure.
  • the STA B 126 may transmit a CTS frame via the primary channel portion of the RF channel 146.
  • the CTS frame may contain an address, which identifies the STA B 126.
  • the CTS frame sent via the primary channel portion of the RF channel 146 may notify STAs and/or APs within the STA_B 126 coverage area (including the AP_1 122) that the STA_B 126 may be preparing to utilize at least a portion of the frequencies within the primary channel bandwidth to transmit signals via the wireless communication medium.
  • the STAs and/or APs may respond to the received CTS frame by refraining from transmitting signals via frequencies contained within at least the primary channel portion of the RF channel 146.
  • a STA and/or AP which receives data frames, which contain an address which identifies it as the singular intended recipient, from the STA B 126, transmitted via at least the primary channel portion of the RF channel 146, may respond by transmitting signals and/or data via frequencies contained within at least the primary channel portion of the RF channel 146.
  • the STA B 126 may subsequently transmit a CTS frame via the secondary channel portion of the RF channel 146.
  • the CTS frame may contain an address, which identifies the STA B 126.
  • the transmitted CTS frame may notify STAs and/or APs within the STA B 126 coverage area that the STA B 126 may be preparing to utilize at least a portion of the frequencies within the secondary channel bandwidth to transmit signals via the wireless communication medium.
  • the STAs and/or APs may respond to the received CTS frame by refraining from transmitting signals via frequencies contained within the secondary channel portion of the RF channel 146.
  • a STA and/or AP which receives data frames, which contain an address which identifies it as the singular intended recipient, from the STA B 126, transmitted via at least the secondary channel portion of the RF channel 146, may respond by transmitting signals and/or data via frequencies contained within at least the secondary channel portion of the RF channel 146.
  • BSS_1 1 12 which are within the coverage area of signals transmitted via the STA B 126, may refrain from transmitting signals via frequencies contained within either the primary channel or secondary channel portions of the RF channel 146.
  • FIG. 2 is an exemplary transceiver system, which may be utilized in connection with an embodiment of the invention.
  • a WLAN STA and/or AP may comprise a transceiver system, which in various embodiments of the invention may not be limited to the exemplary transceiver system presented in FIG. 2.
  • the transceiver system 200 may comprise at least a receiver 202, a transmitter 204, a processor 206, and a memory 208.
  • transmit and receive functions may be separately implemented.
  • the processor 206 may comprise suitable logic, circuitry and/or code to enable digital receiver and/or transmitter functions in accordance with applicable communications standards.
  • the processor 206 may also perform various processing tasks on received data.
  • the processing tasks may comprise computing channel estimates, which may characterize the wireless communication medium, delineating frame boundaries in received data, and computing frame error rate statistics indicative of the presence or absence of detected bit errors in received frame.
  • the processor 206 may also enable the determination of methods for processing received signals.
  • the signal processing methods may comprise selection of one or more RF channels for the reception of signals, and/or the determination of modulation method(s) for detecting data frames received via the selected RF channel(s).
  • the receiver 202 may comprise suitable logic, circuitry and/or code that may enable performance of receiver functions that may comprise, but are not limited to, the amplification of received RF signals, generation of frequency carrier signals corresponding to selected RF channels, the down-conversion of the amplified RF signals by the generated frequency carrier signals, demodulation of data contained in data symbols based on application of a selected demodulation type, and detection of data contained in the demodulated signals.
  • the RF signals may be received via the receiving antenna 222.
  • the data received via the RF signals may be communicated to the processor 206.
  • the transmitter 204 may comprise suitable logic, circuitry and/or code that may enable performance of transmitter functions that may comprise, but are not limited to, modulation of received data to generate data symbols based on application of a selected modulation type, generation of frequency carrier signals corresponding to selected RF channels, the up-conversion of the data symbols by the generated frequency carrier signals, and the generation and amplification of RF signals.
  • the data may be received from the processor 206 and/or memory 208.
  • the RF signals may be transmitted via the transmitting antenna 232.
  • the memory 208 may comprise suitable logic, circuitry and/or code that may enable storage and/or retrieval of data and/or code.
  • the memory 208 may utilize any of a plurality of storage medium technologies, such as volatile memory, for example random access memory (RAM), and/or non-volatile memory, for example electrically erasable programmable read only memory (EEPROM).
  • volatile memory for example random access memory (RAM)
  • non-volatile memory for example electrically erasable programmable read only memory (EEPROM).
  • EEPROM electrically erasable programmable read only memory
  • the memory 208 may enable storage of code for a serial CTS2SELF messaging procedure.
  • the processor 206 may enable an STA B 126 to attempt to access a 40 MHz RF channel 146.
  • the processor 206 may enable generation of a CTS frame, which is transmitted via the primary channel portion of the RF channel 146.
  • the CTS frame may contain an address, which identifies the STA B 126.
  • the processor 206 may send the CTS frame to the transmitter 204.
  • the processor 206 may configure the transmitter 204 to enable transmission of the CTS frame via the primary channel portion of the RF channel 146.
  • the processor 206 may configure the transmitter 204 to utilize a modulation method, for example CCK modulation, when transmitting the CTS frame via the primary channel portion of the RF channel 146.
  • a modulation method for example CCK modulation
  • the processor 206 may enable the subsequent generation of a CTS frame, which may be transmitted via the secondary portion of the RF channel 146.
  • the CTS frame may contain an address, which identifies the STA B 126.
  • the processor 206 may send the CTS frame to the transmitter 204.
  • the processor 206 may configure the transmitter 204 to enable transmission of the CTS frame via the secondary channel portion of the RF channel 146.
  • the processor 206 may configure the transmitter 204 to utilize a modulation method, for example CCK modulation, when transmitting the CTS frame via the secondary channel portion of the RF channel 146.
  • the processor 206 may enable the subsequent determination that access of the wireless communication medium has been gained, which enables a reduced likelihood of data collisions during transmission of data frames via the RF channel 146.
  • the processor 206 may enable generation of subsequent data frames, which may be sent to the transmitter 204 and transmitted via the primary channel portion and/or secondary channel portion of the RF channel 146.
  • the processor 206 may configure the transmitter 204 to utilize a modulation method, for example OFDM, when transmitting the subsequent data frames via the primary and/or secondary channel portions of the RF channel 146.
  • an STA B 126 may attempt to access the wireless communication medium by transmitting a CTS frame 302a via the primary channel. Prior to transmitting the CTS frame, the STA B 126 may perform a clear channel assessment (CCA) to determine whether any other STAs and/or APs are presently transmitting signals and/or data via one or more frequencies contained within the primary channel bandwidth. The STA B 126 may perform the CCA by being configured to receive signals and/or data via any of the frequencies contained within the primary channel bandwidth. The STA B 126 may alternatively attempt to detect signal energy and/or data during the CCA time interval.
  • CCA clear channel assessment
  • STA B 126 may initiate a CCA to determine whether any other STAs and/or APs are presently transmitting signals and/or data via one or more frequencies contained within the secondary channel bandwidth. If the STA B 126 does not detect signals and/or data at subsequent time instants, the STA B 126 may end the CCA at a subsequent time instant, ti.
  • the time duration beginning at time instant t 0 and ending at time instant ti may be specified by a time interval that is specified for a point coordination function interframe spacing (PIFS) time interval.
  • PIFS point coordination function interframe spacing
  • An exemplary PIFS time interval may be specified within applicable IEEE 802.1 1 specifications document(s).
  • the STA B 126 may transmit a CTS frame 302b via the secondary channel at or after the time instant, ti.
  • a time interval following transmission of the CTS frame 302b may begin at a time instant X 2 .
  • the STA B 126 may begin to prepare to transmit data frame(s) via the primary channel and/or secondary channel portions of the RF channel 146.
  • the STA B 126 may commence transmission of data frame(s) at a subsequent time instant t 3 .
  • the time duration beginning at time instant X 2 and ending at time instant t 3 may be specified by a time interval that is specified for an interframe spacing (IFS) time interval.
  • IFS interframe spacing
  • the IFS may comprise a short IFS (SIFS) time interval.
  • SIFS short IFS
  • An exemplary SIFS may be specified within applicable IEEE 802.1 1 specification document(s).
  • the STA B 126 may commence transmission of data frame(s) 304 via the primary and/or the secondary channel portions of the RF channel 146.
  • the CTS frames 302a and/or 302b may specify a time duration, which corresponds to the length of time, which the STA B 146 requests to reserve for utilization of the wireless medium to enable transmission of data frame(s) 304 via the primary channel and/or secondary channel.
  • the requested time duration for the primary channel may end at the time instant t 4 .
  • the requested time duration for the secondary channel may end at the time instant t 4 .
  • the STAs and/or APs receiving the CTS frame 302a via the primary channel may comply with the CTS frame time duration request by refraining from attempting to transmit signal and/or data via any of the frequencies contained within the primary channel bandwidth until a time instant subsequent to the time instant t 4 .
  • STAs and/or APs receiving the CTS frame 302b via the secondary channel may comply with the CTS frame time duration request by refraining from attempting to transmit signal and/or data via any of the frequencies contained within the secondary channel bandwidth until a time instant subsequent to the time instant t 4 .
  • FIG. 4 is a diagram illustrating an exemplary serial clear to send to self messaging procedure for transmission of data frames via the primary channel, in accordance with an embodiment of the invention.
  • FIG. 4 presents an exemplary CTS2SELF messaging procedure in which the primary channel portion of an RF channel 146 may be available for transmission of data frames by an STA B 126 but the secondary channel portion of the RF channel 146 may not be available for transmission of data frames.
  • the STA B 126 may refrain from transmitting a CTS on the secondary channel, and instead, commence transmission of data frame(s) via the primary channel portion of the RF channel 146.
  • the RF channel 146 comprises a 40 MHz bandwidth and each of the primary channel and secondary channel comprise a 20 MHz bandwidth.
  • an STA B 126 may attempt to access the wireless communication medium by transmitting an CTS frame 402 via the primary channel. Following the transmission of the CTS frame 402, at a time instant to, the STA B 126 may initiate a CCA to determine whether any other STAs and/or APs are presently transmitting signals and/or data via one or more frequencies contained within the secondary channel bandwidth. In the exemplary FIG. 4, the STA B 126 may detect channel activity 404 via the secondary channel. The detected channel activity 404 may comprise signals and/or data frames, which may be received by the STA B 126 via one or more frequencies within the secondary channel bandwidth. The STA B 126 may end the CCA at a subsequent time instant, ti.
  • the time duration beginning at time instant t 0 and ending at time instant ti may be specified by a time interval that is specified for a PIFS time interval.
  • the STA B 126 may commence transmission of data frame(s) 406 via the primary channel portion of the RF channel 146 at a time instant subsequent to the time instant ti.
  • the CTS frame 402 may specify a time duration, which corresponds to the length of time, which the STA B 146 may request to be reserved for utilization of the wireless medium to enable transmission of data frame(s) via the primary channel.
  • the requested time duration for the primary channel may end at the time instant t 3 .
  • FIG. 5 is a diagram illustrating an exemplary serial clear to send to self messaging procedure with delayed transmission of data frames via the primary channel and secondary channel, in accordance with an embodiment of the invention.
  • FIG. 5 presents an exemplary CTS2SELF messaging procedure in which the primary channel portion of an RF channel 146 may be available for transmission of data frames by an STA B 126 but the secondary channel portion of the RF channel 146 may not be available for transmission of data frames.
  • the STA B 126 may wait until the secondary channel becomes available and subsequently commences transmission of a second CTS to self frame via the secondary channel and then data frame(s) via the primary channel and secondary channel portions of the RF channel 146.
  • the RF channel 146 comprises a 40 MHz bandwidth and each of the primary channel and secondary channel comprise a 20 MHz bandwidth.
  • an STA B 126 may attempt to access the wireless communication medium by transmitting a CTS frame 502a via the primary channel. Following the transmission of the CTS frame 502a, at a time instant t 0 , the STA B 126 may initiate a CCA to determine whether any other STAs and/or APs are presently transmitting signals and/or data via one or more frequencies contained within the secondary channel bandwidth. In the exemplary FIG. 5, the STA B 126 may detect channel activity 504 via the secondary channel.
  • the STA B 126 may delay attempts to transmit data frames via the primary channel portion of the RF channel 146 and may instead wait until the secondary channel portion of the RF channel 146 becomes available.
  • the detected channel activity 504 may end at a subsequent time instant ti.
  • the STA B 126 may continue CCA for the secondary portion of the RF channel 146 until the subsequent time instant X 2 .
  • the time duration beginning at time instant ti and ending at time instant X 2 may be specified by a time interval that is specified for a PIFS time interval.
  • the STA B 126 may transmit a CTS frame 502b via the secondary channel at or after the time instant, X 2 .
  • a time interval following transmission of the CTS frame 502b may begin at a time instant t 3 .
  • the STA B 126 may begin to prepare to transmit data frame(s) via the primary channel and/or secondary channel portions of the RF channel 146.
  • the STA B 126 may commence transmission of data frame(s) at a subsequent time instant t 4 .
  • the time duration beginning at time instant t 3 and ending at time instant t 4 may be specified by a time interval that is specified for an IFS time interval.
  • the IFS may comprise a SIFS time interval.
  • the STA B 126 may commence transmission of data frame(s) 506 via the primary and/or secondary channel portions of the RF channel 146.
  • the CTS frame 502a may specify a time duration, which corresponds to the length of time, which the STA B 146 requests to reserve for utilization of the wireless medium to enable transmission of data frame(s) via the primary channel.
  • the requested time duration for the primary channel may end at the time instant t 5 .
  • the CTS frame 502b may specify a time duration, which corresponds to the length of time, which the STA B 146 requests to reserve for utilization of the wireless medium to enable transmission of data frame(s) via the secondary channel.
  • the requested time duration for the secondary channel may end at the time instant t 5 .
  • the requested time duration for the secondary channel may be specified such that the requested time duration for the secondary channel ends at about the time instant as the requested time duration for the primary channel.
  • FIG. 6 is a diagram illustrating an exemplary serial clear to send to self messaging procedure with cancellation of access for the primary channel, in accordance with an embodiment of the invention.
  • FIG. 6 presents an exemplary CTS2SELF messaging procedure in which the primary channel portion of an RF channel 146 may be available for transmission of data frames by an STA B 126 but the secondary channel portion of the RF channel 146 may not be available for transmission of data frames.
  • the STA B 126 may cancel access to the wireless medium for utilization of the primary channel portion of the RF channel 146.
  • the STA B 126 may attempt to access the wireless medium at a subsequent time instant.
  • the RF channel 146 comprises a 40 MHz bandwidth and each of the primary channel and secondary channel comprise a 20 MHz bandwidth.
  • an STA B 126 may attempt to access the wireless communication medium by transmitting a CTS frame 602 via the primary channel. Following the transmission of the CTS frame 602, at a time instant t 0 , the STA B 126 may initiate a CCA to determine whether any other STAs and/or APs are presently transmitting signals and/or data via one or more frequencies contained within the secondary channel bandwidth. In the exemplary FIG. 6, the STA B 126 may detect channel activity 604 via the secondary channel. The STA B 126 may delay attempts to transmit data frames via the primary channel portion of the RF channel 146 and may instead wait until the secondary channel portion of the RF channel 146 becomes available.
  • the STA B 126 may release access to the wireless communication medium for transmission of signals via the primary channel portion of the RF channel 146, which may have been acquired in response to transmission of the CTS frame 602.
  • the STA B 126 may end the CCA at a subsequent time instant ti.
  • the time duration beginning at time instant t 0 and ending at time instant ti may be specified by a time interval for a PIFS time interval.
  • a receiving STA may attempt to access the wireless medium to transmit signals via one or more frequencies contained within the primary channel portion of the RF channel 146.
  • the STA B 126 may subsequently attempt to gain access to the wireless communication medium to transmit signals via the primary channel and/or secondary channel portions of the RF channel 146.
  • FIG. 7 is a flowchart illustrating exemplary steps for a serial clear to self message procedure, in accordance with an embodiment of the invention.
  • a STA B 126 may perform a CCA on a primary channel portion of an RF channel 146.
  • the STA B 126 may determine whether the wireless communication medium is available, or clear, to be utilized for transmitting data frames via the frequencies contained within the primary channel bandwidth. In instances when it may be determined that the primary channel may not be clear, in step 704, the STA B 126 may continue the CCA for the primary channel in step 702.
  • step 704 in step 708, the STA B 126 may transmit a CTS frame via the primary channel.
  • step 710 the STA B 126 may perform a CCA on the secondary channel portion of the RF channel 146.
  • step 712 the STA B 126 may determine whether the secondary channel is clear. In instances when it is determined that the secondary channel may be clear in step 712, in step 714, the STA B 126 may transmit a CTS frame via the secondary channel.
  • step 716 the STA B 126 may commence transmission of data frames via the primary and/or secondary channels.
  • the STA B 126 may determine whether to transmit data frames via the primary channel only. In instances when the STA B 126 determines, in step 718, that data frames may be transmitted via the primary channel only, in step 720, the STA B 126 may transmit data frames via the primary channel.
  • the STA B 126 may determine whether to wait for the secondary channel to become clear before transmitting data frames. In instances when the STA B 126 determined, in step 722, to not wait for the secondary channel to become available, in step 724, the STA B 126 may transmit a CF-End frame to release the primary channel. The STA B 126 may subsequently repeat the process beginning at step 702 at a subsequent time instant. [067] In instances when the STA B 126 determined, in step 722, to wait for the secondary channel to become available, the STA B 126 may continue the CCA on the secondary channel at step 710.
  • aspects of a system may include a wireless local area network station (STA) 126, which enables transmission of a channel reservation confirmation message, such as a CTS frame, via a reference RF channel, for example, a primary channel.
  • the STA 126 may enable transmission of one or more subsequent channel reservation confirmation messages, for example CTS frames, via a corresponding one or more subsequent RF channels, for example, a secondary channel.
  • the STA 126 may enable transmission of data frames via the reference RF channel and/or at least a portion of the corresponding one or more subsequent RF channels.
  • the one or more subsequent RF channels may comprise a secondary channel.
  • Various embodiments of the invention may enable the STA 126 to transmit data frames via a primary channel, secondary channel, tertiary channel, &c.
  • the STA 126 may enable assessment of the reference RF channel, for example a CCA, prior to transmitting the channel reservation confirmation message via the reference RF channel.
  • the assessment may comprise attempting to detect signals and/or receive data via the reference RF channel.
  • the channel reservation confirmation message may be transmitted based on the assessment.
  • the STA 126 may enable the sequential assessment of each of the corresponding one or more subsequent RF channels subsequent to transmitting the channel reservation confirmation message via the reference RF channel.
  • the STA 126 may assess a current one of the corresponding one or more subsequent RF channels before assessing the next one.
  • the portion of the one or more subsequent RF channels that are utilized for the transmission of data frames may be selected based on the sequential assessing.
  • the STA 126 may enable transmission of a corresponding one of the subsequent channel reservation confirmation messages subsequent to the sequential assessment of each of the one or more subsequent RF channels.
  • the STA 126 may enable an assessment of a next one of the corresponding one or more subsequent RF channels subsequent to transmitting the current one or the corresponding one or more subsequent channel reservation messages.
  • the STA 126 may assess the next RF channel.
  • the STA 126 may transmit a CTS message as it assesses each of the subsequent RF channels when the channels are assessed to be in a channel clear state.
  • the STA 126 may enable gaining of access to a wireless communication medium based on transmission of a channel reservation confirmation message via the reference RF channel and on transmission of each one of the one or more subsequent channel reservation confirmation messages.
  • the STA 126 may enable concurrent transmission of the data frames via the reference RF channel and at least a portion of the one or more subsequent RF channels subsequent to gaining access to the wireless communication medium based on the transmitted channel reservation confirmation message and on transmission of each of the one or more subsequent channel reservation confirmation messages.
  • the STA 126 may concurrently transmit data frames via the reference RF channel and via each of the subsequent RF channels.
  • a channel reservation may be cancelled based on subsequent RF channel assessments.
  • the STA 126 may enable transmission of a channel reservation confirmation message via a reference RF channel.
  • the STA 126 may enable assessment of one or more subsequent RF channels subsequent to transmission of the channel reservation confirmation message via the reference RF channel.
  • the STA 126 may enable transmission of a channel reservation cancellation message, such as a CF-End frame, via the reference RF channel based on the assessment.
  • the STA 126 may enable transmission of one ore more subsequent channel reservation confirmation messages and one or more corresponding channel reservation cancellation messages.
  • Another embodiment of the invention may provide a machine-readable storage, having stored thereon, a computer program having at least one code section executable by a machine, thereby causing the machine to perform the steps as described herein for a serial clear to send to self messaging procedure.
  • the present invention may be realized in hardware, software, or a combination of hardware and software.
  • the present invention may be realized in a centralized fashion in at least one computer system, or in a distributed fashion where different elements are spread across several interconnected computer systems. Any kind of computer system or other apparatus adapted for carrying out the methods described herein is suited.
  • a typical combination of hardware and software may be a general- purpose computer system with a computer program that, when being loaded and executed, controls the computer system such that it carries out the methods described herein.
  • the present invention may also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods described herein, and which when loaded in a computer system is able to carry out these methods.
  • Computer program in the present context means any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) conversion to another language, code or notation; b) reproduction in a different material form.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur des aspects d'une procédure de messagerie CTS2SELF série. Les aspects d'un système peuvent comprendre une station de réseau local sans fil (STA) qui assure la transmission d'un message de confirmation de réservation de canal, tel qu'une trame CTS, via un canal RF de référence, par exemple, un canal primaire. La STA peut autoriser la transmission d'au moins un message de confirmation de réservation de canal suivant, par exemple des trames CTS, via au moins un canal RF suivant correspondant, par exemple, un canal secondaire. La STA peut assurer la transmission des trames de données via le canal RF de référence et/ou au moins une partie du ou des canaux RF suivants correspondants.
PCT/US2007/083948 2006-11-10 2007-11-07 Procédure de messagerie cts2self série Ceased WO2008060921A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07844949.3A EP2084862B1 (fr) 2006-11-10 2007-11-07 Procédure de messagerie cts2self série
CN2007800298470A CN101502064B (zh) 2006-11-10 2007-11-07 连续自我清除发送消息程序
HK10101237.9A HK1137581B (en) 2006-11-10 2007-11-07 A serial clear to send to self messaging procedure
KR1020097000331A KR101115438B1 (ko) 2006-11-10 2007-11-07 연속 시티에스 투 셀프 메시징 프로시저

Applications Claiming Priority (2)

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US86528406P 2006-11-10 2006-11-10
US60/865,284 2006-11-10

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WO2008060921A1 true WO2008060921A1 (fr) 2008-05-22

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EP (1) EP2084862B1 (fr)
KR (1) KR101115438B1 (fr)
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WO (1) WO2008060921A1 (fr)

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EP2084862B1 (fr) 2013-06-19
US8526349B2 (en) 2013-09-03
EP2084862A1 (fr) 2009-08-05
CN101502064B (zh) 2012-09-05
KR101115438B1 (ko) 2012-02-20
CN101502064A (zh) 2009-08-05
HK1137581A1 (en) 2010-07-30
US20080112380A1 (en) 2008-05-15
KR20090088841A (ko) 2009-08-20

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